Duet not starting up

The printer had stopped a few times mid print, with the PanelDue turning off, and only the VIN LED remaining lit. I had assumed it was a power supply issue, as I was printing PETG, with a higher bed temp than normal, so thought that was making the supply drop out. I changed to a different supply (a meanwell, with enough power to cover higher temp bed), but the same thing happened.

This time though, the duet doesn't seem to want to power back up from 12V. If I plug it in via USB, it starts OK, all LEDs except VIN light up. If I power from 12V, only VIN lights up.

Before I got disconnecting everything to figure out if it's the board, a short, or something else, are there any obvious things I should check first?

Note to self, be sure to use cases where I can clearly see all connections, and triple check terminals!

What's the part number for these terminals so I can order a replacement? Also, is there anything else I should look for that the above could've damaged? I can't see any other damaged components, and traces appear good.